Hi all-

While trouble shooting my electrical system this
weekend, I found I have
fallen victim to the EC-2's ability to power itself
'backward' via the
fuel injector control / power lines.  Yes, Tracy
does warn about this
behavior in the installation manual.  And yes, it
does drain one's
battery very effectively.

His recommended solution is to put on-off switches
for both the primary
and secondary injector pairs.  His logic is this
allows one to disable
an injector pair if it is misbehaving, and at the
same time prevent the
backward EC-2 power phenomenon mentioned above.  I
am not a fan of this
solution - I wired my system with a single switch
primary-both-secondary.  I figure if I have injector
problems, I don't
want to be flipping a pair of switches trying to
find the right
setting.  There is comfort in knowing I need only
flip a single switch
either up or down to disable which ever pair is not
working.

Which brings me to the title of this email --
namely, what kind of diode
to use.  I figure putting a diode into the circuit
will prevent reverse
current flow to the EC-2 without forcing me to add
or change switches.
I know there are plenty of EE types in the group, so
perhaps someone
could educate me on how to select an appropriate
diode for this
application.

Thanks,

Mark
-------------------------------

Maybe I don't understand where you intend to put the
diode, but I don't
think it is a "reverse" current; but rather is in
the same direction as the
normal power to the injectors.  So a diode may not
be your solution.

Al

This is your typical injector driver circuit adapted
from a Megasquirt
schematic. The possible position of the diode is
shown.
The current is several amps peak so chose a diode
that can handle it.
-- 
Paul Lamar ...No rotor no motor.

Paul
The example ckt has the diode backwards; no injector
current can flow. For an application with a diode in
series with the load, a Shottkey diode would be a good
choice. They will have a lower forward conduction
voltage drop than a conventional diode.
regards, Robert

Right you are Robert. My mistake. Try this although I don't know how you
are going to get it into Tracy's computer.
In this case a diode with very little current capacity
is needed.